mothercare........what a complete mess...advice needed

hi, i posted on here a few days ago about our travel system from mothercare, as the seats seemed to tip dd2 up, so her head was lower than her feet.
i took it back and they sent it away to be repaired, we fetched it back today and its been repaired but....the front wheel is bent,doesnt steer properly,difficult to push and its badly marked...it seems as though its been bashed,like head on.

we have returned it and they have fully accepted that its returned in a bad way, but they are saying that they can only send it away again to be fixed....i am so not happy with that,as its the wheels and dh says chassis is knackered, i want a replacement......what would you guys do?

i am without a pram again, using buggy, and thats ok whilst we have nice weather.

I would whizz a letter or email off to their Head Office and ask for a refund. I had problems with the local branch not playing ball with a refund that I was entitled to. They had measured me for a maternity bra and as my bazookas are so big I had to order on-line, then when the bra didn't fit they refused to accept them back (on-line it said I could return them to the shop) and refused to refund my postage. I argued that it was their fault, not mine, that the size was wrong. Anyway a letter to Head Office soon sorted it and I got an additional £10 gift voucher.